| /* |
| |
| bttv-i2c.c -- all the i2c code is here |
| |
| bttv - Bt848 frame grabber driver |
| |
| Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de) |
| & Marcus Metzler (mocm@thp.uni-koeln.de) |
| (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org> |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/init.h> |
| #include <linux/delay.h> |
| |
| #include "bttvp.h" |
| #include <linux/jiffies.h> |
| #include <asm/io.h> |
| |
| static struct i2c_algo_bit_data bttv_i2c_algo_bit_template; |
| static struct i2c_adapter bttv_i2c_adap_sw_template; |
| static struct i2c_adapter bttv_i2c_adap_hw_template; |
| static struct i2c_client bttv_i2c_client_template; |
| |
| static int attach_inform(struct i2c_client *client); |
| |
| static int i2c_debug = 0; |
| static int i2c_hw = 0; |
| static int i2c_scan = 0; |
| module_param(i2c_debug, int, 0644); |
| module_param(i2c_hw, int, 0444); |
| module_param(i2c_scan, int, 0444); |
| MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time"); |
| |
| /* ----------------------------------------------------------------------- */ |
| /* I2C functions - bitbanging adapter (software i2c) */ |
| |
| static void bttv_bit_setscl(void *data, int state) |
| { |
| struct bttv *btv = (struct bttv*)data; |
| |
| if (state) |
| btv->i2c_state |= 0x02; |
| else |
| btv->i2c_state &= ~0x02; |
| btwrite(btv->i2c_state, BT848_I2C); |
| btread(BT848_I2C); |
| } |
| |
| static void bttv_bit_setsda(void *data, int state) |
| { |
| struct bttv *btv = (struct bttv*)data; |
| |
| if (state) |
| btv->i2c_state |= 0x01; |
| else |
| btv->i2c_state &= ~0x01; |
| btwrite(btv->i2c_state, BT848_I2C); |
| btread(BT848_I2C); |
| } |
| |
| static int bttv_bit_getscl(void *data) |
| { |
| struct bttv *btv = (struct bttv*)data; |
| int state; |
| |
| state = btread(BT848_I2C) & 0x02 ? 1 : 0; |
| return state; |
| } |
| |
| static int bttv_bit_getsda(void *data) |
| { |
| struct bttv *btv = (struct bttv*)data; |
| int state; |
| |
| state = btread(BT848_I2C) & 0x01; |
| return state; |
| } |
| |
| static struct i2c_algo_bit_data bttv_i2c_algo_bit_template = { |
| .setsda = bttv_bit_setsda, |
| .setscl = bttv_bit_setscl, |
| .getsda = bttv_bit_getsda, |
| .getscl = bttv_bit_getscl, |
| .udelay = 16, |
| .mdelay = 10, |
| .timeout = 200, |
| }; |
| |
| static struct i2c_adapter bttv_i2c_adap_sw_template = { |
| .owner = THIS_MODULE, |
| #ifdef I2C_CLASS_TV_ANALOG |
| .class = I2C_CLASS_TV_ANALOG, |
| #endif |
| .name = "bt848", |
| .id = I2C_HW_B_BT848, |
| .client_register = attach_inform, |
| }; |
| |
| /* ----------------------------------------------------------------------- */ |
| /* I2C functions - hardware i2c */ |
| |
| static int algo_control(struct i2c_adapter *adapter, |
| unsigned int cmd, unsigned long arg) |
| { |
| return 0; |
| } |
| |
| static u32 functionality(struct i2c_adapter *adap) |
| { |
| return I2C_FUNC_SMBUS_EMUL; |
| } |
| |
| static int |
| bttv_i2c_wait_done(struct bttv *btv) |
| { |
| int rc = 0; |
| |
| /* timeout */ |
| if (wait_event_interruptible_timeout(btv->i2c_queue, |
| btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS) |
| |
| rc = -EIO; |
| |
| if (btv->i2c_done & BT848_INT_RACK) |
| rc = 1; |
| btv->i2c_done = 0; |
| return rc; |
| } |
| |
| #define I2C_HW (BT878_I2C_MODE | BT848_I2C_SYNC |\ |
| BT848_I2C_SCL | BT848_I2C_SDA) |
| |
| static int |
| bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last) |
| { |
| u32 xmit; |
| int retval,cnt; |
| |
| /* sanity checks */ |
| if (0 == msg->len) |
| return -EINVAL; |
| |
| /* start, address + first byte */ |
| xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW; |
| if (msg->len > 1 || !last) |
| xmit |= BT878_I2C_NOSTOP; |
| btwrite(xmit, BT848_I2C); |
| retval = bttv_i2c_wait_done(btv); |
| if (retval < 0) |
| goto err; |
| if (retval == 0) |
| goto eio; |
| if (i2c_debug) { |
| printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]); |
| if (!(xmit & BT878_I2C_NOSTOP)) |
| printk(" >\n"); |
| } |
| |
| for (cnt = 1; cnt < msg->len; cnt++ ) { |
| /* following bytes */ |
| xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART; |
| if (cnt < msg->len-1 || !last) |
| xmit |= BT878_I2C_NOSTOP; |
| btwrite(xmit, BT848_I2C); |
| retval = bttv_i2c_wait_done(btv); |
| if (retval < 0) |
| goto err; |
| if (retval == 0) |
| goto eio; |
| if (i2c_debug) { |
| printk(" %02x", msg->buf[cnt]); |
| if (!(xmit & BT878_I2C_NOSTOP)) |
| printk(" >\n"); |
| } |
| } |
| return msg->len; |
| |
| eio: |
| retval = -EIO; |
| err: |
| if (i2c_debug) |
| printk(" ERR: %d\n",retval); |
| return retval; |
| } |
| |
| static int |
| bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last) |
| { |
| u32 xmit; |
| u32 cnt; |
| int retval; |
| |
| for(cnt = 0; cnt < msg->len; cnt++) { |
| xmit = (msg->addr << 25) | (1 << 24) | I2C_HW; |
| if (cnt < msg->len-1) |
| xmit |= BT848_I2C_W3B; |
| if (cnt < msg->len-1 || !last) |
| xmit |= BT878_I2C_NOSTOP; |
| if (cnt) |
| xmit |= BT878_I2C_NOSTART; |
| btwrite(xmit, BT848_I2C); |
| retval = bttv_i2c_wait_done(btv); |
| if (retval < 0) |
| goto err; |
| if (retval == 0) |
| goto eio; |
| msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff; |
| if (i2c_debug) { |
| if (!(xmit & BT878_I2C_NOSTART)) |
| printk(" <R %02x", (msg->addr << 1) +1); |
| printk(" =%02x", msg->buf[cnt]); |
| if (!(xmit & BT878_I2C_NOSTOP)) |
| printk(" >\n"); |
| } |
| } |
| return msg->len; |
| |
| eio: |
| retval = -EIO; |
| err: |
| if (i2c_debug) |
| printk(" ERR: %d\n",retval); |
| return retval; |
| } |
| |
| static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) |
| { |
| struct bttv *btv = i2c_get_adapdata(i2c_adap); |
| int retval = 0; |
| int i; |
| |
| if (i2c_debug) |
| printk("bt-i2c:"); |
| btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT); |
| for (i = 0 ; i < num; i++) { |
| if (msgs[i].flags & I2C_M_RD) { |
| /* read */ |
| retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num); |
| if (retval < 0) |
| goto err; |
| } else { |
| /* write */ |
| retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num); |
| if (retval < 0) |
| goto err; |
| } |
| } |
| return num; |
| |
| err: |
| return retval; |
| } |
| |
| static struct i2c_algorithm bttv_algo = { |
| .master_xfer = bttv_i2c_xfer, |
| .algo_control = algo_control, |
| .functionality = functionality, |
| }; |
| |
| static struct i2c_adapter bttv_i2c_adap_hw_template = { |
| .owner = THIS_MODULE, |
| #ifdef I2C_CLASS_TV_ANALOG |
| .class = I2C_CLASS_TV_ANALOG, |
| #endif |
| .name = "bt878", |
| .id = I2C_HW_B_BT848 /* FIXME */, |
| .algo = &bttv_algo, |
| .client_register = attach_inform, |
| }; |
| |
| /* ----------------------------------------------------------------------- */ |
| /* I2C functions - common stuff */ |
| |
| static int attach_inform(struct i2c_client *client) |
| { |
| struct bttv *btv = i2c_get_adapdata(client->adapter); |
| int addr=ADDR_UNSET; |
| |
| |
| if (ADDR_UNSET != bttv_tvcards[btv->c.type].tuner_addr) |
| addr = bttv_tvcards[btv->c.type].tuner_addr; |
| |
| |
| if (bttv_debug) |
| printk(KERN_DEBUG "bttv%d: %s i2c attach [addr=0x%x,client=%s]\n", |
| btv->c.nr, client->driver->driver.name, client->addr, |
| client->name); |
| if (!client->driver->command) |
| return 0; |
| |
| if (btv->tuner_type != UNSET) { |
| struct tuner_setup tun_setup; |
| |
| if ((addr==ADDR_UNSET) || |
| (addr==client->addr)) { |
| |
| tun_setup.mode_mask = T_ANALOG_TV | T_DIGITAL_TV | T_RADIO; |
| tun_setup.type = btv->tuner_type; |
| tun_setup.addr = addr; |
| bttv_call_i2c_clients(btv, TUNER_SET_TYPE_ADDR, &tun_setup); |
| } |
| |
| } |
| |
| return 0; |
| } |
| |
| void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg) |
| { |
| if (0 != btv->i2c_rc) |
| return; |
| i2c_clients_command(&btv->c.i2c_adap, cmd, arg); |
| } |
| |
| static struct i2c_client bttv_i2c_client_template = { |
| .name = "bttv internal", |
| }; |
| |
| |
| /* read I2C */ |
| int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for) |
| { |
| unsigned char buffer = 0; |
| |
| if (0 != btv->i2c_rc) |
| return -1; |
| if (bttv_verbose && NULL != probe_for) |
| printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ", |
| btv->c.nr,probe_for,addr); |
| btv->i2c_client.addr = addr >> 1; |
| if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) { |
| if (NULL != probe_for) { |
| if (bttv_verbose) |
| printk("not found\n"); |
| } else |
| printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n", |
| btv->c.nr,addr); |
| return -1; |
| } |
| if (bttv_verbose && NULL != probe_for) |
| printk("found\n"); |
| return buffer; |
| } |
| |
| /* write I2C */ |
| int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1, |
| unsigned char b2, int both) |
| { |
| unsigned char buffer[2]; |
| int bytes = both ? 2 : 1; |
| |
| if (0 != btv->i2c_rc) |
| return -1; |
| btv->i2c_client.addr = addr >> 1; |
| buffer[0] = b1; |
| buffer[1] = b2; |
| if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes)) |
| return -1; |
| return 0; |
| } |
| |
| /* read EEPROM content */ |
| void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr) |
| { |
| memset(eedata, 0, 256); |
| if (0 != btv->i2c_rc) |
| return; |
| btv->i2c_client.addr = addr >> 1; |
| tveeprom_read(&btv->i2c_client, eedata, 256); |
| } |
| |
| static char *i2c_devs[128] = { |
| [ 0x1c >> 1 ] = "lgdt330x", |
| [ 0x30 >> 1 ] = "IR (hauppauge)", |
| [ 0x80 >> 1 ] = "msp34xx", |
| [ 0x86 >> 1 ] = "tda9887", |
| [ 0xa0 >> 1 ] = "eeprom", |
| [ 0xc0 >> 1 ] = "tuner (analog)", |
| [ 0xc2 >> 1 ] = "tuner (analog)", |
| }; |
| |
| static void do_i2c_scan(char *name, struct i2c_client *c) |
| { |
| unsigned char buf; |
| int i,rc; |
| |
| for (i = 0; i < 128; i++) { |
| c->addr = i; |
| rc = i2c_master_recv(c,&buf,0); |
| if (rc < 0) |
| continue; |
| printk("%s: i2c scan: found device @ 0x%x [%s]\n", |
| name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); |
| } |
| } |
| |
| /* init + register i2c algo-bit adapter */ |
| int __devinit init_bttv_i2c(struct bttv *btv) |
| { |
| memcpy(&btv->i2c_client, &bttv_i2c_client_template, |
| sizeof(bttv_i2c_client_template)); |
| |
| if (i2c_hw) |
| btv->use_i2c_hw = 1; |
| if (btv->use_i2c_hw) { |
| /* bt878 */ |
| memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_hw_template, |
| sizeof(bttv_i2c_adap_hw_template)); |
| } else { |
| /* bt848 */ |
| memcpy(&btv->c.i2c_adap, &bttv_i2c_adap_sw_template, |
| sizeof(bttv_i2c_adap_sw_template)); |
| memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template, |
| sizeof(bttv_i2c_algo_bit_template)); |
| btv->i2c_algo.data = btv; |
| btv->c.i2c_adap.algo_data = &btv->i2c_algo; |
| } |
| |
| btv->c.i2c_adap.dev.parent = &btv->c.pci->dev; |
| snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name), |
| "bt%d #%d [%s]", btv->id, btv->c.nr, |
| btv->use_i2c_hw ? "hw" : "sw"); |
| |
| i2c_set_adapdata(&btv->c.i2c_adap, btv); |
| btv->i2c_client.adapter = &btv->c.i2c_adap; |
| |
| #ifdef I2C_CLASS_TV_ANALOG |
| if (bttv_tvcards[btv->c.type].no_video) |
| btv->c.i2c_adap.class &= ~I2C_CLASS_TV_ANALOG; |
| if (bttv_tvcards[btv->c.type].has_dvb) |
| btv->c.i2c_adap.class |= I2C_CLASS_TV_DIGITAL; |
| #endif |
| |
| if (btv->use_i2c_hw) { |
| btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap); |
| } else { |
| bttv_bit_setscl(btv,1); |
| bttv_bit_setsda(btv,1); |
| btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap); |
| } |
| if (0 == btv->i2c_rc && i2c_scan) |
| do_i2c_scan(btv->c.name,&btv->i2c_client); |
| return btv->i2c_rc; |
| } |
| |
| int __devexit fini_bttv_i2c(struct bttv *btv) |
| { |
| if (0 != btv->i2c_rc) |
| return 0; |
| |
| if (btv->use_i2c_hw) { |
| return i2c_del_adapter(&btv->c.i2c_adap); |
| } else { |
| return i2c_bit_del_bus(&btv->c.i2c_adap); |
| } |
| } |
| |
| /* |
| * Local variables: |
| * c-basic-offset: 8 |
| * End: |
| */ |